| 摘要 |
PURPOSE:To provide an exchange system capable of calling even when a portable terminal roams from a call area to the other call area. CONSTITUTION:When radio terminal equipment 23a... and 24a... belonging to the call area roam to the other call area and the number of the radio terminal equipment 23a... and 24a... in the call area becomes equal to or less than a prescribed number, the relation between the call area and the radio terminal equipment 23a... and 24a... in the call area stored in a storage means 16 is changed and an incoming call processing is performed to base stations 21a... and 22a... corresponding to the other call area relating to the radio terminal equipments 23a... and 24a... belonging to the call area.
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